package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    /**
     * 过滤未登录的请求
     * @param servletRequest
     * @param servletResponse
     * @param filterChain
     * @throws IOException
     * @throws ServletException
     */
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取URI
        String requestURI = request.getRequestURI();
        //2.定义放行uri组
        String[] uris = {
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg/**",
                "/user/login/**"
        };
        //3.检测请求的uri是否需要拦截
        for (String uri : uris) {
            if (PATH_MATCHER.match(uri,requestURI)){
                filterChain.doFilter(request,response);
                return;
            }
        }
        //4.判断登陆状态
        log.info("用户登陆id为 {}",request.getSession().getAttribute("employee"));
        Long empId = (Long) request.getSession().getAttribute("employee");
        BaseContext.setCurrentId(empId);
        if (request.getSession().getAttribute("employee") != null){
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户登陆id为 {}",request.getSession().getAttribute("user"));
        Long userId = (Long) request.getSession().getAttribute("user");
        BaseContext.setCurrentId(userId);
        if (request.getSession().getAttribute("user") != null){
            filterChain.doFilter(request,response);
            return;
        }

        //5.回写数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;


    }
}
